Scaling, placement & rightsizing
EC2 placement groups vs Proximity placement groups & availability sets
EC2 placement groups have no single Azure equivalent.
Cluster placement maps to proximity placement groups, while spread and partition placement map to availability sets or scale-set fault domains.
Side-by-side comparison
| Aspect | Amazon Web Services | Microsoft Azure |
|---|---|---|
| Service | EC2 placement groups | Proximity placement groups & availability sets |
| Lifecycle | Generally available | Generally available |
| What it is | Placement strategies. Cluster packs instances for low-latency HPC. Partition keeps groups on separate racks. Spread puts each instance on distinct hardware. Precision time places instances near high-precision time sources. | A proximity placement group co-locates VMs, scale sets, and availability sets in one datacenter for low latency. Availability sets and scale-set fault domains spread VMs across racks. |
| Pricing model | Placement groups are free. | Proximity placement groups and availability sets are free. |
| Docs | EC2 placement groups docs | Proximity placement groups & availability sets docs |
| Pricing page | EC2 placement groups pricing | Proximity placement groups & availability sets pricing |
| Exams | SAA-C03 SOA-C03 | AZ-104 AZ-305 |
Key differences
- Cluster ↔ proximity placement group. Both co-locate VMs for low latency. Azure pins the group to one datacenter when the first VM deploys, so declare all needed sizes up front (the "intent") to avoid allocation failures.
- Spread and partition ↔ availability sets or fault domains. Azure spreads VMs across fault and update domains inside a datacenter, or across zones with zonal deployments. EC2 spread puts each instance on distinct racks, and partition gives named rack groups (Hadoop, Kafka, Cassandra).
- EC2 also has a "precision time" strategy (hosts close to high-precision time sources). Azure has no named equivalent.
Pricing summary
Pricing models only. No prices are quoted because they change by region and over time.
- AWS
- Placement groups are free. EC2 placement groups pricing →
- Azure
- Proximity placement groups and availability sets are free. Proximity placement groups & availability sets pricing →
Certification exam mapping
| Exam | Provider | Level | Status |
|---|---|---|---|
| AWS Certified Solutions Architect – Associate SAA-C03 | AWS | Associate | current Italian version retires after Dec 31, 2026. |
| AWS Certified CloudOps Engineer – Associate SOA-C03 | AWS | Associate | current Replaces AWS Certified SysOps Administrator – Associate (SOA-C02), whose last exam day was Sep 29, 2025. Simplified Chinese and Korean versions retire after Nov 19, 2026. |
| Microsoft Certified – Azure Administrator Associate AZ-104 | Azure | Associate | current |
| Microsoft Certified – Azure Solutions Architect Expert AZ-305 | Azure | Expert | current English version updated Apr 17, 2026. |
Relevance is based on each exam's published scope, not a line-by-line objective match. Check the official study guide.
FAQ
What is the Azure equivalent of EC2 placement groups?
EC2 placement groups have no single Azure equivalent. Cluster placement maps to proximity placement groups, while spread and partition placement map to availability sets or scale-set fault domains.
How does pricing compare between EC2 placement groups and Proximity placement groups & availability sets?
AWS: Placement groups are free. Azure: Proximity placement groups and availability sets are free. Check the official pricing pages for current rates.
Which certification exams cover this topic?
AWS Certified Solutions Architect – Associate (SAA-C03); AWS Certified CloudOps Engineer – Associate (SOA-C03); Microsoft Certified – Azure Administrator Associate (AZ-104); Microsoft Certified – Azure Solutions Architect Expert (AZ-305).